Open the email with a button

Hi, I created a button on the toolbar of my menu that must open my pec box; I created a blank procedure that writes a header in the onexcecute (“location: http://webmail.pec.it/index.html?v=v4r2b26.20191205_0900”);
When the launch opens the email screen to enter the password, but does not go further, it remains blocked. Because ?
Or suggest me another solution
Thank you